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Our Global Leaders


  • Mark Tercek

    "I want to be able to look my kids in the eye and tell them I did all I could to leave the world a better place."

    Mark Tercek is Chief Executive Officer of The Nature Conservancy (TNC), the global conservation organization known for its intense focus on collaboration and getting things done for the benefit of people and nature. He is the author of the Washington Post and Publisher’s Weekly bestselling book Nature’s Fortune: How Business and Society Thrive by Investing in Nature.

    Growing up as a city kid in Cleveland, Mark was a late-bloomer to conservation. It was becoming a parent that sparked his passion for nature. “I want to be able to look my kids in the eye,” he says, “and tell them I did all I could to leave the world a better place.”

    A former managing director and Partner for Goldman Sachs, where he spent 24 years, Mark brings deep business experience to his role leading The Nature Conservancy. He is a champion of the idea of natural capital—valuing nature for its own sake as well as for the services it provides for people, such as clean air and water, productive soils and a stable climate.

  • Brian McPeek

    "The Conservancy has been putting innovation to work for nature for 60+ years. Now it is time to push ourselves even further."

    As President of The Nature Conservancy, Brian McPeek sets the vision and strategy that guides the organization’s conservation, science, external affairs, development and marketing priorities across 72 countries to tackle the most pressing global challenges facing nature and people.

    During his 15 year tenure with the Conservancy, McPeek has held a number of leadership roles, including field project director in Southeast Colorado, Deputy Director of the Colorado Program, Regional Managing Director for North America, Chief Operating Officer and Chief Conservation Officer.

  • Justin Adams

    "The conservation movement has to do more to find solutions that incorporate environmental and societal needs into economic development decisions."

    Justin Adams is Executive Director of the Tropical Forest Alliance (seconded to the TFA from The Nature Conservancy). Previously, Justin served as the Global Managing Director for Lands at The Nature Conservancy, where he led a broad team of Conservancy staff operating at the intersection of global development and environmental challenges, including sustainable agriculture, forests and climate change, smart infrastructure, and indigenous and communal conservation.

    He believes passionately that we have to find new models to balance competing priorities for land including food security, sustainable energy production and sustainable livelihoods, while also conserving and restoring nature to deliver the critical ecosystem services on which all life depends.

  • Giulio Boccaletti

    "Water is the silent currency that runs through the global economy."

    Giulio Boccaletti, Ph.D., is the Chief Strategy Officer at The Nature Conservancy. Trained as a scientist, Giulio is an expert on environmental and economic sustainability. In his role as Chief Strategy Officer, Giulio works with other members of the Executive Team to develop the organization’s strategy and apply economic and scientific practice to our conservation agenda.

  • Maria Damanaki

    "If we’re going to see the ocean as limitless, we will destroy it. Humanity must choose whether we will be the greatest danger to the ocean, or its greatest hope."

    Maria Damanaki is the Global Managing Director for Oceans at The Nature Conservancy. She leads a global team focused on transforming how the world manages its oceans, with a focus on investing in natural infrastructure, such as coral reefs and wetlands, to reduce climate risks and sustain ocean health; promoting sustainable fisheries management and legal fish trade; and managing and protecting ocean and coastal habitats in ways that continue to provide benefits to nature and people.

    She believes that the only path to lasting, tangible results for a sustainable blue economy is collaboration across public, private and civil sectors – at both global and local levels – while always respecting the needs of both nature and people.

  • Pascal Mittermaier

    "Imagine a city that is a part of nature not apart from nature."

    Pascal Mittermaier is the Global Managing Director for Cities at The Nature Conservancy. He leads a team at the Conservancy focused on transforming how the world’s growing cities harness nature’s power to build resilient, livable, thriving communities for millions of people. TNC’s urban work uses innovative science to find nature-based solutions for some of the biggest challenges of our time: Urban water, air pollution, excessive urban heat, urban sprawl, and biodiversity extinction. TNC’s urban conservation teams work with a wide group of global partners to explore the health benefits of nature in cities, while also focusing on nature as a way to tackle inequality and exclusion.

  • Glenn Prickett

    "We must celebrate the increasing leadership countries, companies and communities are making for our climate."

    Glenn Prickett oversees international and U.S. government relations, corporate practices and sustainability efforts, and relationships with leading international institutions and non-governmental organizations for the Conservancy. He joined the Conservancy in January 2010 after two decades working on international environment and development policy.

  • Lynn Scarlett

    "Leaders on climate will be rewarded."

    Former Deputy Secretary and Chief Operating Officer of the U.S. Department of the Interior, Lynn Scarlett is Co-Chief External Affairs Officer at The Nature Conservancy (TNC) and the Global Climate Strategy Lead.

    In this role, Scarlett directs all policy in the United States and the 70 countries in which TNC operates. Scarlett also served at Interior as the Acting Secretary of the Interior in 2006.

  • Heather Tallis

    "People are connected to nature in nearly everything we do and value."

    Heather Tallis is Global Managing Director, Lead Scientist for Strategy Innovation for The Nature Conservancy. In this role, she leads a Strategy Innovation Science Team that drives TNC science to unlock rapid, large-scale change at the interface of the environment, society and the economy. Tallis will explore new opportunities at the intersection of conservation and human well-being and help to expand the impact of TNC and conservation for both nature and people through new sector influence and strategy development.

  • Marc Diaz

    Impact investing will be similarly transformative. This new approach to conservation can mobilize significant financial resources to tackle the biggest challenges of our time.

    Marc oversees NatureVest, The Nature Conservancy’s impact investing division, which focuses on delivering measurable environmental outcomes as well as financial returns to investors. NatureVest fosters ways to invest in conservation by convening investors; developing and executing innovative financial transactions; and building an investment pipeline across multiple sectors, including agriculture, fisheries and environmental markets. Marc leads the twelve-person team that advances these activities.


  • Michelle Lakly

    Michelle 'Shelly' Lakly has been with The Nature Conservancy for over eight years and has served in the roles of State Director in Georgia and Florida, the Eastern Division Director for North America Region and now the role of Managing Director of the Saving Rivers Strategy.